"Is there any concise name for words that are nouns ... not always? There are about 100 such words in English."
"You don't happen to have a nice neat list of them, do you?"
Here's one:
The following is a list of English words that have the same spelling (homographs) but different accentuation according to their grammatical function. In such pairs the noun usually has the accent on the first syllable, the verb on the second.
ABsent (adjective) abSENT (verb)
ABstract (noun or adjective) abSTRACT (verb)
ACcent (noun) acCENT (verb)
ADdress (noun) adDRESS (verb)
Adept (noun) aDEPT (adjective)
aRITHmetic (noun) arithMETic (adjective) AUgust (noun) auGUST (adjective)
COLLect (noun) coLLect (verb)
COMmune (noun) comMUNE (verb)
COMpound (noun) comPOUND (verb)
COMpress (noun) COMpress (verb)
CONcert (noun) conCERT (verb)
CONduct (noun) conDUCT (verb)
CONflict (noun) conFLICT (verb)
CONsort (noun) conSORT (verb)
conSUMMate (adjective) CONsummate (verb)
CONtract (noun) conTRACT (verb)
CONtest (noun) conTEST (verb)
CONvict (noun) conVICT (verb)
CONvoy (noun) conVOY (verb)
DEcrease (noun) deCREASE (verb)
DEfault (noun) deFAULT (verb)
DEScant (noun) desCANT (verb)
DESert (noun) deSERT (verb)
DEtail (noun) deTAIL (verb)
DICtate (noun) dicTATE (verb)
DIgest (noun) diGEST (verb)
DIScount (noun) disCOUNT (verb)
ENvelope (noun) enVELope (verb)
EScort (noun) esCOURT (verb)
ESSay (noun) eSSAY (verb)
EXpert (noun) exPERT (adjective)
EXploit (noun) exPLOIT (verb)
EXport (noun) exPORT (verb)
EXtract (noun) exTRACT (verb)
FERment (noun) ferMENT (verb)
FREquent (adjective) freQUENT (verb)
IMpact (noun) imPACT (verb)
IMport (noun) imPORT (verb)
IMpress (noun) imPRESS (verb)
IMprint (noun) imPRINT (verb)
INcense (noun) inCENSE (verb)
INcrease (noun) inCREASE (verb)
INstinct (noun) inSTINCT (adjective) INsult (noun) inSULT (verb)
INterdict (noun) interDICT (verb)
INvalid (noun or adjective) inVALid (adjective)
MInute (noun) miNUTE (adjective)
misCONduct (noun) misconDUCT (verb)
NAtal (noun) NAtal (adjective)
OBject (noun) obJECT (verb)
RECord (noun) reCORD (verb)
PERfect (adjective) perFECT (verb)
PERfume (noun) perFUME (verb)
PERmit (noun) perMIT (verb)
PREsent (noun) preSENT (verb)
PROduce (noun) proDUCE (verb)
PROject (noun) proJECT (verb)
REbel (noun) reBEL (verb)
REcord (noun) reCORD (verb)
REfill (noun) reFILL (verb)
REsearch (noun) reSEARCH (verb)
SUSpect (noun) susPECT (verb)
TRANSport (noun) transPORT (verb)
TRANSfer (noun) transFER (verb)
http://www.traditio.com/tradlib/lateng.txt
Some dialects add "cement" and "police". (Menken gives "cement" without comment.) I'd add "defense", "reject", and "subject". My own dialect uses only the first syllable accent for "accent", "august", "convoy", "consummate", "expert", "natal"; and I don't have "collect" as a noun, "descant" as a verb, "ferment" as an adjective, "instinct" as an adjective,
Evan Kirshenbaum + HP Laboratories >There's been so much ado already
1501 Page Mill Road, 1U, MS 1141 >that any further ado would bePalo Alto, CA 94304 >excessive.
(650)857-7572
http://www.kirshenbaum.net/